A powerful surge of water overtopping a sea wall and knocking down everything in its path. This was the famous tidal bore on the Quiantang River in China. A tidal bore is a wave that advances up a river mouth during extreme tide swings. People in this area gather here annually to view this event, but that year, the incoming tide was extremely strong and there appears to be very large ocean swells as well. According to the news agencies, no one was killed, but there were some injuries.